plotly#581 adding full-blown color specification to the scatter3d line and using it in the conversion

Author: monfera

src/traces/scatter3d/attributes.js

@@ -97,11 +97,12 @@ module.exports = {
         z: makeProjectionAttr('z')
     },
     connectgaps: scatterAttrs.connectgaps,
-    line: {
-        color: scatterLineAttrs.color,
+    line: extendFlat({}, {
         width: scatterLineAttrs.width,
         dash: scatterLineAttrs.dash
     },
+        colorAttributes('line')
+    ),
     marker: extendFlat({}, {  // Parity with scatter.js?
         symbol: {
             valType: 'enumerated',

src/traces/scatter3d/convert.js

@@ -204,7 +204,7 @@ function convertPlotlyOptions(scene, data) {
     };
 
     if('line' in data) {
-        params.lineColor = str2RgbaArray(line.color);
+        params.lineColor = formatColor(line, 1, len);
         params.lineWidth = line.width;
         params.lineDashes = line.dash;
     }